login
This site is supported by donations to The OEIS Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A015413 Gaussian binomial coefficient [ n,11 ] for q=-8. 2
1, -7635497415, 66629509457629850745, -571227449525600988055816521095, 4908004671908135948969747939905903872633, -42158152544207284340561914581652169948472972883335 (list; graph; refs; listen; history; text; internal format)
OFFSET

11,2

REFERENCES

J. Goldman and G.-C. Rota, The number of subspaces of a vector space, pp. 75-83 of W. T. Tutte, editor, Recent Progress in Combinatorics. Academic Press, NY, 1969.

I. P. Goulden and D. M. Jackson, Combinatorial Enumeration. Wiley, NY, 1983, p. 99.

M. Sved, Gaussians and binomials, Ars. Combinatoria, 17A (1984), 325-351.

LINKS

Vincenzo Librandi, Table of n, a(n) for n = 11..110

FORMULA

a(n) = Product_{i=1..11} ((-8)^(n-i+1)-1)/((-8)^i-1) (by definition). - Vincenzo Librandi, Nov 06 2012

MATHEMATICA

Table[QBinomial[n, 11, -8], {n, 11, 20}] (* Vincenzo Librandi, Nov 06 2012 *)

PROG

(Sage) [gaussian_binomial(n, 11, -8) for n in xrange(11, 17)] # Zerinvary Lajos, May 28 2009

(MAGMA) r:=11; q:=-8; [&*[(1-q^(n-i+1))/(1-q^i): i in [1..r]]: n in [r..20]]; // Vincenzo Librandi, Nov 06 2012

CROSSREFS

Sequence in context: A104851 A226950 A225141 * A288090 A075131 A250865

Adjacent sequences:  A015410 A015411 A015412 * A015414 A015415 A015416

KEYWORD

sign,easy

AUTHOR

Olivier Gérard

STATUS

approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified March 20 21:49 EDT 2019. Contains 321352 sequences. (Running on oeis4.)